Shallow Grave {1B} |Instant| Return the top creature card of your graveyard to the battlefield. That creature gains haste until end of turn. Exile it at the beginning of the next end step.

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At the end of turn, Shallow Grave's dealyed triggered ability ["At the beginning of the next end step, exile it"] will go on the stack. When it resolves, it will exile the creature if it is still on the battlefield.

Otherwise, the ablity does nothing. It does not replace cards going to the Graveyard. It does not stop Doomgape triggers. It does not exile cards in the graveyard.

The Unearth mechanic would have removed it from the game, because it has an important extra sentence of rules baggage.

Maybe your friend just thought the same would happen with Shallow Grave. Aways read the card!

Quote:

702.82a Unearth is an activated ability that functions while the card with unearth is in a graveyard. “Unearth [cost]” means “[Cost]: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step. If it would leave the battlefield, exile it instead of putting it anywhere else. Activate this ability only any time you could cast a sorcery.”

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